992
FNCA52 TJSJ 190730
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
330 AM AST TUE MAY 19 2026
DISCUSSION
A GRADUAL INCREASE IN MOISTURE TODAY COULD PREVENT RH VALUES FROM
DECREASING BELOW THRESHOLD VALUES FOR PROLONGED PERIODS; HOWEVER,
RAINFALL SHOULD REMAIN LIMITED ACROSS THE SOUTHERN PLAINS,
ALLOWING RELATIVE HUMIDITY TO DROP TO CRITICAL FIRE WEATHER
THRESHOLDS IN THE REGION. ADDITIONALLY, SUSTAINED WINDS OF 15 TO
20 MPH, WITH HIGHER GUSTS, COMBINED WITH ELEVATED KBDI VALUES,
WILL FAVOR THE RAPID SPREAD OF WILDFIRES ACROSS THE SOUTHERN
COASTAL PLAINS. THE LOW 7- DAY PERCENT OF NORMAL RAINFALL WILL
ALSO PERSIST ACROSS THE SOUTHEASTERN COASTAL PLAINS. FIRE
MANAGEMENT PARTNERS ARE URGED TO REMAIN VIGILANT.
PRZ014-192000-
SOUTHEAST COASTAL PLAINS-
330 AM AST TUE MAY 19 2026
TODAY TONIGHT WED
CLOUD COVER MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 30 30
TEMP (24H TREND) 90 (+2) 72 (-2) 89
RH % (24H TREND) 47 (-5) 88 (+6) 49
WIND 20FT/EARLY(MPH) E 16 E 14 E 18
WIND 20FT/LATE(MPH) E 17 E 11 E 18
MIXING HGT(FT-AGL/MSL)5690 4970
TRANSPORT WND (MPH) E 18 E 20
VENT RATE (KT-FT) 91040 84490
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ015-192000-
SOUTHERN HILLS-
330 AM AST TUE MAY 19 2026
TODAY TONIGHT WED
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 20 30
TEMP (24H TREND) 86 (+3) 68 (-3) 86
RH % (24H TREND) 57 (-5) 96 (+9) 59
WIND 20FT/EARLY(MPH) E 14 E 13 E 14
WIND 20FT/LATE(MPH) E 13 E 12 E 14
MIXING HGT(FT-AGL/MSL)6530 5720
TRANSPORT WND (MPH) E 18 E 20
VENT RATE (KT-FT) 104480 97240
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ016-192000-
NORTH COASTAL PLAINS-
330 AM AST TUE MAY 19 2026
TODAY TONIGHT WED
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 40 40 50
TEMP (24H TREND) 89 (+1) 71 (-2) 89
RH % (24H TREND) 57 (-3) 95 (+7) 56
WIND 20FT/EARLY(MPH) E 16 E 19 E 17
WIND 20FT/LATE(MPH) E 23 E 12 E 20
MIXING HGT(FT-AGL/MSL)6500 5120
TRANSPORT WND (MPH) E 18 E 18
VENT RATE (KT-FT) 104000 81920
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ017-192000-
NORTHERN HILLS-
330 AM AST TUE MAY 19 2026
TODAY TONIGHT WED
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 50 30 60
TEMP (24H TREND) 88 (+1) 69 (-1) 88
RH % (24H TREND) 56 (-4) 97 (+7) 58
WIND 20FT/EARLY(MPH) E 14 E 17 E 16
WIND 20FT/LATE(MPH) E 20 E 9 E 18
MIXING HGT(FT-AGL/MSL)7500 6360
TRANSPORT WND (MPH) E 17 E 16
VENT RATE (KT-FT) 112500 89040
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ018-192000-
WEST COAST-
330 AM AST TUE MAY 19 2026
TODAY TONIGHT WED
CLOUD COVER MCLEAR MCLEAR PCLDY
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 30 10 60
TEMP (24H TREND) 91 (+1) 72 (0) 91
RH % (24H TREND) 54 (-7) 93 (+6) 57
WIND 20FT/EARLY(MPH) E 14 E 14 E 16
WIND 20FT/LATE(MPH) E 16 E 11 E 17
MIXING HGT(FT-AGL/MSL)5570 4770
TRANSPORT WND (MPH) E 14 E 14
VENT RATE (KT-FT) 66840 57240
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ019-192000-
EASTERN INTERIOR-
330 AM AST TUE MAY 19 2026
TODAY TONIGHT WED
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 40 50
TEMP (24H TREND) 87 (+2) 69 (-3) 87
RH % (24H TREND) 59 (-2) 98 (+9) 60
WIND 20FT/EARLY(MPH) E 16 E 16 E 16
WIND 20FT/LATE(MPH) E 16 E 14 E 16
MIXING HGT(FT-AGL/MSL)6480 5390
TRANSPORT WND (MPH) E 18 E 17
VENT RATE (KT-FT) 103680 80850
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ022-192000-
LUQUILLO MOUNTAIN RANGE-
330 AM AST TUE MAY 19 2026
TODAY TONIGHT WED
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 40 50
TEMP (24H TREND) 82 (+3) 67 (-4) 82
RH % (24H TREND) 66 (-3) 100 (+9) 65
WIND 20FT/EARLY(MPH) E 13 E 12 E 13
WIND 20FT/LATE(MPH) E 13 E 11 E 13
MIXING HGT(FT-AGL/MSL)4130 3740
TRANSPORT WND (MPH) E 21 E 20
VENT RATE (KT-FT) 74340 63580
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ023-192000-
CENTRAL MOUNTAIN RANGE-
330 AM AST TUE MAY 19 2026
TODAY TONIGHT WED
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 50 20 50
TEMP (24H TREND) 87 (+5) 66 (-2) 86
RH % (24H TREND) 58 (-7) 98 (+8) 61
WIND 20FT/EARLY(MPH) E 11 E 9 E 11
WIND 20FT/LATE(MPH) E 11 E 8 E 11
MIXING HGT(FT-AGL/MSL)8210 7020
TRANSPORT WND (MPH) E 13 E 16
VENT RATE (KT-FT) 90310 98280
DISPERSION 5 5
DSI 6 2 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ024-192000-
CAYEY MOUNTAIN RANGE-
330 AM AST TUE MAY 19 2026
TODAY TONIGHT WED
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 40 40
TEMP (24H TREND) 82 (+1) 68 (-2) 82
RH % (24H TREND) 64 (-2) 100 (+8) 67
WIND 20FT/EARLY(MPH) E 12 E 10 E 12
WIND 20FT/LATE(MPH) E 12 E 10 E 12
MIXING HGT(FT-AGL/MSL)5310 4280
TRANSPORT WND (MPH) E 18 E 18
VENT RATE (KT-FT) 84960 68480
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ025-192000-
VIEQUES-
330 AM AST TUE MAY 19 2026
TODAY TONIGHT WED
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 40 50
TEMP (24H TREND) 87 (+1) 74 (-2) 87
RH % (24H TREND) 60 (-2) 89 (+5) 59
WIND 20FT/EARLY(MPH) E 19 E 19 E 19
WIND 20FT/LATE(MPH) E 18 E 18 E 18
MIXING HGT(FT-AGL/MSL)4080 3820
TRANSPORT WND (MPH) E 25 E 24
VENT RATE (KT-FT) 89760 80220
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ026-192000-
CULEBRA-
330 AM AST TUE MAY 19 2026
TODAY TONIGHT WED
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 40 50
TEMP (24H TREND) 89 (+2) 76 (-2) 89
RH % (24H TREND) 58 (-4) 89 (+7) 57
WIND 20FT/EARLY(MPH) E 19 E 19 E 19
WIND 20FT/LATE(MPH) E 18 E 19 E 19
MIXING HGT(FT-AGL/MSL)4140 3600
TRANSPORT WND (MPH) E 25 E 25
VENT RATE (KT-FT) 91080 79200
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ027-192000-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
330 AM AST TUE MAY 19 2026
TODAY TONIGHT WED
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS NONE SHOWERS
CHANCE PRECIP (%) 10 0 10
TEMP (24H TREND) 91 (+2) 73 (-1) 91
RH % (24H TREND) 47 (-7) 86 (+6) 48
WIND 20FT/EARLY(MPH) E 20 E 20 E 21
WIND 20FT/LATE(MPH) E 21 E 16 SE 23
MIXING HGT(FT-AGL/MSL)5630 5090
TRANSPORT WND (MPH) E 22 E 23
VENT RATE (KT-FT) 106970 101800
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ001-192000-
SAINT THOMAS AND SAINT JOHN-
330 AM AST TUE MAY 19 2026
TODAY TONIGHT WED
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 30 40
TEMP (24H TREND) 86 (+1) 75 (-3) 86
RH % (24H TREND) 62 (-2) 90 (+8) 61
WIND 20FT/EARLY(MPH) E 19 E 19 E 20
WIND 20FT/LATE(MPH) E 18 E 19 E 18
MIXING HGT(FT-AGL/MSL)3940 3630
TRANSPORT WND (MPH) E 25 E 23
VENT RATE (KT-FT) 86680 72600
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ002-192000-
ST CROIX-
330 AM AST TUE MAY 19 2026
TODAY TONIGHT WED
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 20 40
TEMP (24H TREND) 87 (+1) 75 (-2) 87
RH % (24H TREND) 61 (-3) 91 (+8) 61
WIND 20FT/EARLY(MPH) E 18 E 18 E 18
WIND 20FT/LATE(MPH) E 17 E 18 E 17
MIXING HGT(FT-AGL/MSL)5180 4380
TRANSPORT WND (MPH) E 23 E 24
VENT RATE (KT-FT) 103600 91980
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
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